[MPlayer-users] Incorrect HE AAC audio playback

Loren Merritt lorenm at u.washington.edu
Tue Apr 6 02:34:37 CEST 2004

On Mon, 5 Apr 2004, Piotr Michniewski wrote:
> Recently, I tried to open a movie in the Matroska format. It contains 5.1
> audio in HE AAC. The audio was played, but the channels were wrong (i don't
> have a 5.1 card). In the left speaker I heard the central channel and in the
> right I heard one of the other channels. I think that MPlayer incorrectly
> downmixes 5.1 AAC audio.

By default, MPlayer doesn't downmix at all, it just ignores extra
channels. To play AAC 5.1 on my stereo setup, I use:

mplayer -af pan=6:.32:.39:.06:.17:-.17:.33:.32:.06:.39:-.17:.17:.33

I don't know if this is the optimal matrix; I copied the coefficients from

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